{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:22VBCDTIRY55I3TI2MZMCIMIJ6","short_pith_number":"pith:22VBCDTI","canonical_record":{"source":{"id":"2101.05625","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2021-01-10T10:23:11Z","cross_cats_sorted":["cs.CY","cs.LG"],"title_canon_sha256":"66c35be5d45e31b8b4d7a9b6546342e1fe208854deff73ea996064fc838682a1","abstract_canon_sha256":"ede88233ec6f0bf4327caf836474402747d259f5110759dd1094ca4868b4ab35"},"schema_version":"1.0"},"canonical_sha256":"d6aa110e688e3bd46e68d332c121884fa6c925407113c05a10e0368b54296834","source":{"kind":"arxiv","id":"2101.05625","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2101.05625","created_at":"2026-07-05T02:07:16Z"},{"alias_kind":"arxiv_version","alias_value":"2101.05625v2","created_at":"2026-07-05T02:07:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2101.05625","created_at":"2026-07-05T02:07:16Z"},{"alias_kind":"pith_short_12","alias_value":"22VBCDTIRY55","created_at":"2026-07-05T02:07:16Z"},{"alias_kind":"pith_short_16","alias_value":"22VBCDTIRY55I3TI","created_at":"2026-07-05T02:07:16Z"},{"alias_kind":"pith_short_8","alias_value":"22VBCDTI","created_at":"2026-07-05T02:07:16Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:22VBCDTIRY55I3TI2MZMCIMIJ6","target":"record","payload":{"canonical_record":{"source":{"id":"2101.05625","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2021-01-10T10:23:11Z","cross_cats_sorted":["cs.CY","cs.LG"],"title_canon_sha256":"66c35be5d45e31b8b4d7a9b6546342e1fe208854deff73ea996064fc838682a1","abstract_canon_sha256":"ede88233ec6f0bf4327caf836474402747d259f5110759dd1094ca4868b4ab35"},"schema_version":"1.0"},"canonical_sha256":"d6aa110e688e3bd46e68d332c121884fa6c925407113c05a10e0368b54296834","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:07:16.620771Z","signature_b64":"8MS4c3JMIlF2mqCK+o3ieGxAd2g6vJGuydZyKHmMokdG6577ilFK0b9C09Lz+qudoOv1tqK8RseaJsbAH7a7DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d6aa110e688e3bd46e68d332c121884fa6c925407113c05a10e0368b54296834","last_reissued_at":"2026-07-05T02:07:16.620389Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:07:16.620389Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2101.05625","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T02:07:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DsdrTOqx/LbbsZtZpX54ZSgpOKfYzBzkaLGBewYfLLCdRNMsBQXJ//XtNK74IJeMmT2n6RP1VUgxyHm+7FX9Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T03:34:12.103374Z"},"content_sha256":"c9a14cb33eec4ca98768cf8506faced1fa85998dc8eac3ad52d52950d110cc67","schema_version":"1.0","event_id":"sha256:c9a14cb33eec4ca98768cf8506faced1fa85998dc8eac3ad52d52950d110cc67"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:22VBCDTIRY55I3TI2MZMCIMIJ6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Learning Student Interest Trajectory for MOOCThread Recommendation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.CY","cs.LG"],"primary_cat":"cs.IR","authors_text":"Andrew Lan, George Karypis, Jaideep Srivastava, Shalini Pandey","submitted_at":"2021-01-10T10:23:11Z","abstract_excerpt":"In recent years, Massive Open Online Courses (MOOCs) have witnessed immense growth in popularity. Now, due to the recent Covid19 pandemic situation, it is important to push the limits of online education. Discussion forums are primary means of interaction among learners and instructors. However, with growing class size, students face the challenge of finding useful and informative discussion forums. This problem can be solved by matching the interest of students with thread contents. The fundamental challenge is that the student interests drift as they progress through the course, and forum co"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2101.05625","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2101.05625/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T02:07:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QhaWoe49y+lPPF9Qw/gh+JG5JNtRKuFXSbHQ2Ex7eohVkMa5Q+5Pqah89DZhVbH1BDFuUeHirBfHd0SvRzR2AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T03:34:12.104361Z"},"content_sha256":"9de2699980b67f3b5c6b84892538f38054b53842e6e0d9876da70ce2bda1dd5a","schema_version":"1.0","event_id":"sha256:9de2699980b67f3b5c6b84892538f38054b53842e6e0d9876da70ce2bda1dd5a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/22VBCDTIRY55I3TI2MZMCIMIJ6/bundle.json","state_url":"https://pith.science/pith/22VBCDTIRY55I3TI2MZMCIMIJ6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/22VBCDTIRY55I3TI2MZMCIMIJ6/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-08-18T03:34:12Z","links":{"resolver":"https://pith.science/pith/22VBCDTIRY55I3TI2MZMCIMIJ6","bundle":"https://pith.science/pith/22VBCDTIRY55I3TI2MZMCIMIJ6/bundle.json","state":"https://pith.science/pith/22VBCDTIRY55I3TI2MZMCIMIJ6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/22VBCDTIRY55I3TI2MZMCIMIJ6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:22VBCDTIRY55I3TI2MZMCIMIJ6","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"ede88233ec6f0bf4327caf836474402747d259f5110759dd1094ca4868b4ab35","cross_cats_sorted":["cs.CY","cs.LG"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2021-01-10T10:23:11Z","title_canon_sha256":"66c35be5d45e31b8b4d7a9b6546342e1fe208854deff73ea996064fc838682a1"},"schema_version":"1.0","source":{"id":"2101.05625","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2101.05625","created_at":"2026-07-05T02:07:16Z"},{"alias_kind":"arxiv_version","alias_value":"2101.05625v2","created_at":"2026-07-05T02:07:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2101.05625","created_at":"2026-07-05T02:07:16Z"},{"alias_kind":"pith_short_12","alias_value":"22VBCDTIRY55","created_at":"2026-07-05T02:07:16Z"},{"alias_kind":"pith_short_16","alias_value":"22VBCDTIRY55I3TI","created_at":"2026-07-05T02:07:16Z"},{"alias_kind":"pith_short_8","alias_value":"22VBCDTI","created_at":"2026-07-05T02:07:16Z"}],"graph_snapshots":[{"event_id":"sha256:9de2699980b67f3b5c6b84892538f38054b53842e6e0d9876da70ce2bda1dd5a","target":"graph","created_at":"2026-07-05T02:07:16Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2101.05625/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In recent years, Massive Open Online Courses (MOOCs) have witnessed immense growth in popularity. Now, due to the recent Covid19 pandemic situation, it is important to push the limits of online education. Discussion forums are primary means of interaction among learners and instructors. However, with growing class size, students face the challenge of finding useful and informative discussion forums. This problem can be solved by matching the interest of students with thread contents. The fundamental challenge is that the student interests drift as they progress through the course, and forum co","authors_text":"Andrew Lan, George Karypis, Jaideep Srivastava, Shalini Pandey","cross_cats":["cs.CY","cs.LG"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2021-01-10T10:23:11Z","title":"Learning Student Interest Trajectory for MOOCThread Recommendation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2101.05625","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:c9a14cb33eec4ca98768cf8506faced1fa85998dc8eac3ad52d52950d110cc67","target":"record","created_at":"2026-07-05T02:07:16Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"ede88233ec6f0bf4327caf836474402747d259f5110759dd1094ca4868b4ab35","cross_cats_sorted":["cs.CY","cs.LG"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2021-01-10T10:23:11Z","title_canon_sha256":"66c35be5d45e31b8b4d7a9b6546342e1fe208854deff73ea996064fc838682a1"},"schema_version":"1.0","source":{"id":"2101.05625","kind":"arxiv","version":2}},"canonical_sha256":"d6aa110e688e3bd46e68d332c121884fa6c925407113c05a10e0368b54296834","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d6aa110e688e3bd46e68d332c121884fa6c925407113c05a10e0368b54296834","first_computed_at":"2026-07-05T02:07:16.620389Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:07:16.620389Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8MS4c3JMIlF2mqCK+o3ieGxAd2g6vJGuydZyKHmMokdG6577ilFK0b9C09Lz+qudoOv1tqK8RseaJsbAH7a7DA==","signature_status":"signed_v1","signed_at":"2026-07-05T02:07:16.620771Z","signed_message":"canonical_sha256_bytes"},"source_id":"2101.05625","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c9a14cb33eec4ca98768cf8506faced1fa85998dc8eac3ad52d52950d110cc67","sha256:9de2699980b67f3b5c6b84892538f38054b53842e6e0d9876da70ce2bda1dd5a"],"state_sha256":"939d570a77d872dc5f87df110178662051109292477b7f71885e6dd429206735"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yuiXLZHQq2qAVPSC69muC5Rdi4KhgLC0faN/HEbfxB1I8mLRiBvcSDCWn2jOi6FrDJH9Q/RvGhgyO/Czd+47DQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-18T03:34:12.111448Z","bundle_sha256":"9bbc304733b6578abea21a781a7c3d5ed52e55351423166fb152a0f1a69d2e5f"}}